/*
* Copyright (c) 2007, Nubo Technologies
* 
* All rights reserved.
* 
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
*    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
*    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
*    * Neither the name of the Nubo Technologies nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.nubotech.gwt.oss.browser.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;
import com.nubotech.gwt.oss.browser.client.ui.BrowserView;
import com.nubotech.gwt.oss.browser.client.ui.GenUrlView;
import com.nubotech.gwt.oss.browser.client.ui.LoginView;
import com.nubotech.gwt.oss.browser.client.ui.RegisterView;
import com.nubotech.gwt.oss.browser.client.ui.View;
import com.nubotech.gwt.oss.client.auth.AuthenticationManager;
import com.nubotech.gwt.oss.client.util.LogUtil;
import java.util.HashMap;
import java.util.Map;

public class Main implements EntryPoint, ValueChangeHandler {
    
    private static final Images images = (Images) GWT.create(Images.class);

    public interface Images extends BrowserView.Images {
    }
    
    private VerticalPanel viewContainer;
    private Widget curView;
    
    private BrowserView browserView = new BrowserView(images);
    
    private static Map store = new HashMap();
    
    public void onHistoryChanged(String token) {
        if ("login".equals(token)) {
            showView(new LoginView());            
        }
        else if ("register".equals(token)) {
            showView(new RegisterView());
        }
        else if ("logout".equals(token)) {
            AuthenticationManager mgr = AuthenticationManager.instance();
            showView(new Label("")); // to refresh the cur view
            mgr.logout();
            showView(browserView);
        }
        else if ("genurl".equals(token)) {
            showView(new GenUrlView());
        }
        else {
            showView(browserView);
        }
    }
    
    public void onModuleLoad() {
        viewContainer = new VerticalPanel();
        viewContainer.setWidth("100%");

        // Note: to start the browser
        // http://s3.amazonaws.com/<bucket>/OSSBrowser.html
        History.addValueChangeHandler(this);

        RootPanel.get().add(viewContainer);
     
        if (Window.Location.getParameter("view") != null) {
            onHistoryChanged(Window.Location.getParameter("view"));
        }
        else {
            showView(browserView);
        }
    }
        
    public void showView(Widget view) {
        if (view == curView) {
            return;
        }
        
        // Remove the old view from the display area.
        if (curView != null) {
            viewContainer.remove(curView);
        }
        
        curView = view;
        
        // Display the new view.    
        curView.setVisible(false);
        viewContainer.add(curView);
        viewContainer.setCellHorizontalAlignment(curView, VerticalPanel.ALIGN_CENTER);
        curView.setVisible(true);
        
        // onShow
        if (view instanceof View) {
            ((View)view).onShow();
        }
    }

    public void onValueChange(ValueChangeEvent event) {
        onHistoryChanged((String) event.getValue());
    }


    public static Images images() {
        return images;
    }
    
    public static void put(String key, Object value) {
        store.put(key, value);
    }
    
    public static Object get(String key) {
        return store.get(key);
    }

}
